Section 4 Overview of procedure
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance Notes for the Certification of Masts, Spars and Standing Rigging, January 2017 - Chapter 1 Guidance notes for the certification of masts, spars and standing rigging - Section 4 Overview of procedure

Section 4 Overview of procedure

Parent topic: Chapter 1 Guidance notes for the certification of masts, spars and standing rigging

4.1 Procedure

4.1.1 This Section gives an overview of the procedure. Technical implementation is described within Section 5 and beyond.

4.1.2 The procedure is framed on the manufacturer providing an operation manual giving the weather and sea conditions in which the rig is designed to be used. This includes limiting wind speeds and other conditions for different sail settings, reefing, setting sail and performing manoeuvres such as tack and gybe.

4.1.3 The choice of sailing conditions and specification of the design loads in any of these cases is the responsibility of the manufacturer. In addition a ‘survival’ condition is to be described, typically with all sails and spars stowed.

4.1.4 The certification will be based on the conditions given in the operations manual.

4.1.5 The procedure is further framed on the manufacturer both certifying and providing evidence that:

  1. The rig is designed to withstand, with a factor of safety acceptable to LR for the material and load type, the forces from wind, motions and gravity and manoeuvres in all foreseeable operation conditions as shown in the operations manual and during transitions between these conditions.
  2. The loads on chain plates and mast supports will under no circumstances exceed the loads for which these points and the hull and superstructure in way are designed and approved.
  3. The rig is built in accordance with the design from materials that after manufacture of the rig have the properties that were assumed in the design. The materials are required to maintain these properties for the design life of the yacht, assuming normal use and maintenance of the yacht and rigging. Alternatively, renewal requirements are to be included in the maintenance manual.
  4. The rig can be built, transported, stepped on the yacht and tuned without detrimentaleffects on the rig, or on the hull and superstructure of the yacht. Detrimental effects can occur from motions during transport or lifting. Composite structure can incur internal damage due to insufficient support without showing damage on the outside.
  5. The prescribed inspections and maintenance procedures can be expected to be carried out effectively while applying normal safe working procedures and without detrimental effects on the rigging or on the hull and superstructure of the yacht.

4.1.6  Testimony and evidence, as specified above, should be contained within the TCF.

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